Furnace



(No Model.)

P. A. GOODWIN.

FURNAGE.

No. 431,458. Patented July l, 1890.

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UNITED STATES PATENT OFFICE.

PETER A. GOODWIN, OVENSBOROUGH, KENTUCKY.

FURNAQE.

SPECIFICATION forming part of Letters Patent No. 431,458, dated .Tilly1, 1890.

Application filed May 21, 1889. Renewed February 7, 1890. Serial No.339,514. No model.)

To all whom t may concern,.-

Be it known that I, PETER A. GOODWIN, a citizen of the United States,residing at Owensborough, in the county di Daviess and State ofKentucky, have invented certain new and useful Improvements in Furnacesfor Steam- Boilers; and I do hereby declare that the following is afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to furnaces forsteamboilers or other purposes.

The object of my invention is to secure complete combustionof the fuel.

It is well known that in furnaces having forced orinduced draft throughthe fire-chamber a large per cent. of the gaseousA products ofcombustion pass oif unconsumed and are therefore wasted. This is due inpart to the irregular quantity and improper condition of the airintroduced. Good results have been attained by the introduction of airat the proper place in properly-regulated quantities and at the propertemperature; and my invention consists in improved means for heatingair, regulating the amount to be used,

and to secure its introduction at the proper point to insure completecombustion.

In the drawings formingapart ot' this specieation, Figure l is a plan ofa boiler and a section through the boiler-furnace on the line of Fig. 3.Fig. 2 is a longitudinal section through the furnace on the line z e' ofFig. 3. Fig. 3 is a transverse section through the furnace on the line yy of Figs. 1 and 2, the boiler' being shown in elevation; and Fig. 4 isan elevation of a coil or system of pipes suitable for use in theheater-boxes or the bridge-wall.

Ais an ordinary boiler, and B is the brickwork of a furnace therefor.Within the side walls of the-furnace I arrange preliminary heating-coilsor systems of pipes C C. These coils are provided with valves c c,through the medium of which the admission of cold air is regulated. Thecoils or pipes communicate with heater-boxes D D, arranged abreast ofthe lower part of the boiler and forming the inner wall of the furnace.The heater-boxes communica-te with a chamber E in the bridge-wall of thefurnace by means of pipe-connections d d. They also are providedwithlateral nipples or perforations d d for discharging air across thefurnace just in front of and near the bridge-wall. The

, chamber E in the bridge-wall is also provided with perforations ornipples c c for discharging air into the furnace at vthe bridge-wall,where it unites with and consumes the escaping gases resulting fromimperfect combustion. There may be arranged in the heaterboxes and inthe chamber in the bridge-wall coils or systems of pipes, as shown inFig. 4., or of any desired forni and construction, or either of thesemay be dispensed with and a coil alone substituted therefor.

In operation, the valves being open, air is admitted to the preliminaryheating-coils C C in the walls of the furnace, and, becoming heated,passes onto the boxes D D to be further heated, and is thence dischargedin part through pipes d d to the chamber E, where the heat is furtheraugmented, and thence through perforations e e at the bridge-wall.Simultaneously air is discharged laterally across the furnace in frontof the bridge-wall through nipples or perforations d d. The perforationsthrough the walls of chamber E may be horizontally forward and backwardvertically and at all angles between to mix the heated air with theescaping gases.

The invention described is simple and easily applied. It secures ascomplete combustion and prevents waste as well as the most elaborate andcomplicated contrivance hitherto devised. According to my plan anynumber of boilers may be set up side by side and all equally suppliedwith hot air to enhancecombustion. The lateral discharge of air from theheater-boxes D'D, in connection with the discharge in all directionsfrom the chamber in the bridge-wall, produces such countercurrents as tosecure a most perfect commingling of air with the products of imperfectcombustion. Y

Having now described my invention, what I claim is- 1. In an air-feedingfurnace for steam-boilers, the combination of preliminary heatingcoilsarranged in the side walls, heating boxes or coils connected with saidheating-coils arranged abreast of the boiler and forming the inner wallof the furnace, and a chamber or coil in the bridge-wall communicatingwith IOO said heating-boxes provided with perforations for discharginghot air at the bridge-Wall, substantially as described.

2. In an air-feeding furnace for steam-boilers, the combination ofpreliminary heatingcoils arranged in the side Walls, heating boxes orcoils connected with said heating-coils arranged abreast of the boiler,and a chamber or coil in the bridgeWail, the chamber and theheating-boxes being perforated, as described, to dischargecounter-currents of heated air about the bridge-Wall, substantially asdescribed.

3. The combination, in a furnace, of valved preliminary heating coils,heating boxes abreast the boiler, and a chamber in the brldge-Wallcommunicating With each other, the chamber and the heating-boxes beingprovided with openings to discharge countercurrents about thebridge-Wall of the furnace, substantially as described.

In testimony whereof I aiiix my signature in presence of two Witnesses.

PETER A. GOODWIN. Vitnesses:

JAS. H. PARRISH, K. GEIBEL, J r.

